The One Hundred Fifth Wisconsin Legislature convened from January 4, 2021, to January 3, 2023, in regular session.

Senators representing even-numbered districts were newly elected for this session and were serving the first two years of a four-year term.

Assembly members were elected to a two-year term.

[1] Senators representing odd-numbered districts were serving the third and fourth year of their four-year term, having been elected in the general election held on November 6, 2018.

[2] The governor of Wisconsin during this entire term was Democrat Tony Evers, of Dane County, serving the second two years of a four-year term, having won election in the 2018 Wisconsin gubernatorial election.